I love stories based on rules, and this is definitely one of those. I can't tell you almost any of them without giving spoilers, because learning the rules is a big part of the fun of the book. It was darker and creepier than I expected -- but only until I understood the rules, and then it was just interesting. The narrative mechanic is very clever, and it is one that I can't believe hasn't been used by more authors. It is kind of like an excellent Doctor Who story, and I suspect someone will make a movie out of it -- in the right hands it could be absolutely charming. That is, for a terrifyingly horrific nightmare story. I was glad I read it, and was sorry when it was over. I guess I'll have to check out his other books!